Shaft-governor.



E. SCHWETER. SHAFT GOVERNOR. APPLICATION FILED APR.22, 191a.

Patented Dec. 23, 1913.

2 SHEETS-SHEET 1.

FIGJ- H a w A Try E. SGHWETER. SHAFT GOVERNOR. APPLICATION FILED APR. 22, 1913.

1,082,242,, Patented Dec. 23, 1913.

2 SHEETS-SHEET 2.

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COLUMBIA PLANOGRAPH C0..w/\sH1Nu'roN. D. C

UNTTE ERICI-I SCHWETER, OF GOLUTVIIN, RUSSIA.

SHAFT-GOVERNOR.

T0 aZZ whom it may concern Be it known that I, Enron Sorrwnrnn, engineer, a subject of the King of Prussia, residing at Golutwin, Russia, have invented new and useful Improvements in Shaft- Governors, of which the following is a specification.

My invention relates to improvements in shaft-governors of the kind, in which two opposite radially guided centrifugal weights are pivotally connected together by means of two opposite pairs of links, the outer ends of which are radially guided in a direction at right angles to the motion of the centrifugal weights and are connected with a movable eccentric.

The chief improvement consists in that two opposite pivots for connecting the outer ends of the two opposite pairs of links are positively guided and are loaded for counteracting the influence upon the two centrifugal weights of the centrifugal force of the valve gear attacking the eccentric, which influence varies with the filling of the engine cylinder, so that the governor is prevented from becoming labile.

Another improvement consists in that means are provided for varying the pressure between the movable e centric and the governor casing, so as to adjust the resistance of the eccentric against shifting.

T will now roceed to describe my invention with re 'erence to the accompanying drawing, in which Figure 1 is a section through the improved shaft-governor in a plane at right angles to the shaft, Fig. 2 is a section through the shaft in a plane in front of the governor, the eccentric-strap being removed, and Fig. 3 is a plan view of the shaft-governor, only the lower half of the eccentric-strap being shown.

Similar letters of reference refer to similar parts throughout the several views.

A cylindrical casing 0 is shown as keyed upon the engine shaft j and having formed in its interior two opposite large guides b b in a central line passing through the axis of the shaft and two opposite small guides i 2' in a central line at right angles to that of the large guides b b. Two opposite centrifugal weights at a are respectively guided in the two large guides b b and two blocks 71. h in the two small guides i 2". Each block it or it has a cross slot h and a pivot f or g passing through this slot. Two opposite Specification of Letters Patent.

Application filed Apri122, 1913.

Patented Dec. 23,1918.

Serial No. 762,884.

pairs of links d d are provided, the outer ends of which can turn on the two pivots f 9, while their inner ends engage in suitable slots of the two centrifugal weights a a and can turn on pivots a" a passing through these slots. It will be seen, that in this manner the two centrifugal. weights at a are on both sides of the shaftpivotally connected together by means of the two pairs of links 62 d, so that they are obliged to simultaneously move through the same distance in opposite directions outward 01' inward, the same as the two blocks h it.

Two opposite bolts 0 0 are in any known manner screwed into the nave e of the easing 0 in the central line of the two centrifugal weights a a. For example the two bolts 0 0 are shown as provided with squares 0 0", which can be turned by means of suitable screw-keys. The two centrifugal weights at a are each provided with a hole a concentric with the bolt 0 or 0 and having at the inner end a shoulder. The casing c has two opposite inner tubular projections c 0 in the axis of the two bolts 0 0, which projections have for the most part the same inner diameter as the two holes a a, so that two opposite helical springs is can be inserted in the two holes a a and be made to bear against their inner shoulders as shown. The outer parts of the two bolts 0 0' have screw-threads n a over which two long nuts m m can be screwed in any known manner. The two nuts m m are made in one with circular heads Z Z, which fit in suitable recesses of the projections c c and are adapted to compress the two helical springs k In, whereby the two centrifugal weights a a are pressed against the nave e of the casing 0. Suitable recesses c 0 may be provided in the casing 0 for permitting the two pairs of links (Z (Z' to play during the outward motion of the two centrifugal weights (1 a and the inward motion of the two blocks h it.

The casing 0 is on the front closed with a suitable cover 9 fastened on its rim in any known manner and tightly fitting the shaft j. The cover 9 is provided with two radial slots (not shown) on both sides of the shaft j, in which slots the two pivots f g can freely move. Each pivot f or g has on the outer end a square head 7 or 9 provided with a cross hole and movable on the outside of the cover 9. An eccentric r provided with a large slot 3/ and a small slot y IL A parallel thereto, also with two outer arms 8 s in the central line of the large slot y is put over the engine shaft j and is pressed against the outside of the cover Q by means of a helical spring surrounding a stud it, which is fastened in the cover q and passes through the small slot y, while two nuts a a bearing against the outer end of the spring 6 by means of a washer u serve for regulating the tension of this spring. The two arms 8 s of the eccentric r have in their inner faces two recesses 11 v, in which the two square heads 7 g of the pivots f g engage, so that in this manner the eccentric 9' is guided on the cover q. A long pin to is shown as passing through a suitable hole in the upper wall of the right arm st and through the cross hole in he head f, and engaging in a recess in the lower wall of the a m s, so that in this manner the eccentrio 1" is rigidly connected with the right pivot f and is obliged to partake in the motion of the same. For securing the long pin to a leaf spring a; is fastened on the right arm a of the eccentric r. The left arm 8 is also provided with a similar leaf spring a; for securing a short pin to, which is made to fill up only the upper hole in the arm a, so that the left square head 9 can freely move in the recess 1) of the arm 8 during the motion of the eccentric r relatively to the cover 9. In this case the en ine shaft 7' is supposed to run in one direction. In case the engine shaft is to run in the opposite direction, the eccentric r will require to be rigidly connected with the left pivot 9, so that the two pins 10 w of different length will have to be exchanged for one another.

The casing 0 may be filled up with oil for lubricating the inner movable parts, which oil may be introduced through a suitable hole that afterward can be closed with a tap 72. However, this lubrication is immaterial to my invention.

A strap 2 (Fig. may be put around the eccentric r by means of screws 2 or the like for transmit-ting the motion to the respective valve gear. Normally the center of the eccentric r is to occupy a certain position 2' (Fig. 2) at the respective angle to the crank (not shown), but when the speed of the engine increases and the eccentric 1" is moved by the governor, its center is more or less shifted to the left and at the most to the point 2. This motion may be limited by the two tubular projections c c which the two centrifugal weights (1, a may strike.

The shaft-governor operates as follows: Before starting the engine the center of the eccentric r will be at 2 (Fig. 2), but after the start the two centrifugal weights a a will move outward while overcoming the tension of the two helical springs is k and at the same time they will by means of the two pairs of links (Z (Z draw inward the two blocks h h. The centrifugal force of the reciprocating parts of the valve gear will exert its influence upon the two pivots f g and thereby upon the two centrifugal weights. In order to prevent the governor from becoming labile under this influence, the two blocks it h are made to serve as centrifugal weights. By selecting the proper weight of the two blocks 71. h the governor can be made nearly astatic, so that the known curve of centrifugal force becomes more and more similar to a straight line. here so preferred, the two blocks 7t it may be so modified, that they do not serve as centrifugal weights proper, but springs of any known construction (not shown) are employed for pressing the two blocks 71 it outward, so as to render the governor highly sensitive. This may be done, however, for smaller degrees of irregularity only, such as for example 1.

It is possible by more or less compressing the helical spring 2, to adjust at will the pressure between the eccentric r and the cover 9 and thus to vary the resistance of the eccentric 1 against shifting. This is particularly desirable in case the shocks emanating from the valve gear and acting upon the governor cannot be exactly ascertained.

In order to prevent the shocks emanating from the valve gear of the respective engine from causing the centrifugal weights a a to strike the nave e of the governor casing 0 the angle made by the two links (Z (Z in each pair should be kept small, so as to enable the centrifugal weights at a to automatically check their motion during shocks.

The shaft-governor described can be varied in many respects without departing from the spirit of my invention.

I claim:

1. In a governor for engines, a rotatable engine shaft, a governor casing fastened thereon and comprising two opposite large radial guides and two opposite small radial guides at right angles to the large guides, two centrifugal weights movable in said two large guides, two blocks movable in said two 7 small guides, two pairs of links pivotally connected at the inner ends with said two centrifugal weights and at the outer ends with said two blocks, two projections on said two blocks passing through two radial slots in said governor-casing to without, an eccentric movable on the outside of said governor-casing and havin two recessed arms, in the recesses of which said projections engage whereby the eccentric is guided relatively to the governor-casing, means for rigidly c0nnecting either of said two projections with the corresponding arm of said eccentric, two springs bearing inward against said two centrifugal weights, and means for pressing said two blocks outward for attaining the desired degree of reliability of the governor.

2. In a governor for engines, a rotatable engine-shaft, a governorcasing fastened thereon and comprising two opposite large radial guides and two opposite small radial guides at right angles to the large guides, two centrifugal weights movable in said two large guides, two blocks movable in said two small guides and adapted to serve as centrifugal weights, two pairs of links pivotally connected at the inner ends with said two centrifugal weights and at the outer ends with said two blocks, two projections on said two blocks passing through two radial slots in said governor-casing to without an ec- 15 centric movable on the outside of said governor-casing and having two arms, in which said two projections are guided whereby the eccentric is guided relatively to the governor-casing, means for rigidly connecting either of said two projections with the corresponding arm of said eccentric, and two springs bearing inward against said two centrifugal weights.

In testimony whereof I affix my signature in presence of two witnesses.

ERICH SCHWVETER.

WVitnesses LOUIS VANDORY, GERTRUDE SCHEFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

